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Publication Abstract from PubMed

We have previously reported a potent neuraminidase inhibitor that comprises a carbocyclic analogue of zanamivir in which the hydrophilic glycerol side chain is replaced by the hydrophobic 3-pentyloxy group of oseltamivir. This hybrid inhibitor showed excellent inhibitory properties in the neuraminidase inhibition assay (Ki =0.46 nM; Ki (zanamivir) =0.16 nM) and in the viral replication inhibition assay in cell culture at 10-8 M. As part of this lead optimization, we now report a novel spirolactam that shows comparable inhibitory activity in the cell culture assay to that of our lead compound at 10-7 M. The compound was discovered serendipitously during the attempted synthesis of the isothiourea derivative of the original candidate. The X-ray crystal structure of the spirolactam in complex with the N8 subtype neuraminidase offers insight into the mode of inhibition.

Serendipitous Discovery of a Potent Influenza Virus A Neuraminidase Inhibitor.,Mohan S, Kerry PS, Bance N, Niikura M, Pinto BM Angew Chem Int Ed Engl. 2013 Dec 11. doi: 10.1002/anie.201308142. PMID:24339250^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.